please don't tell me this is the supercharger

I was riding passenger in my car today and when you floor it you can hear a rattling noise coming from the front of the car passenger side. I have heard this months ago when my dad drove it, and didn't hear it again but thats because I never rode passenger since. What could this be??

 

Could be the upper motor mount ---

 

Yeah if you have an 05' - and the rattling sound seems to be coming from behind the glove box, then the upper hydraulic engine mount is probably shot.

Check below and around it for signs of brownish fluid having leaked and dried off....and you can always just lift the bonnet and watch/listen for it while someone rev's the bloody thing too.....

 

do you have the original exhaust system??

does this happens when the rev's go beyond de 4,000~ 5,000 rpms ???

I'm having the same problem .... started today.... mine is a MCS 2005 automatic tranny ...

 

I've got the original exhaust. Yeah happens somewhere around there....if it is a motor mount does anyone know what the cost of those are?

college student and I don't want to run to mommy and daddy for money

 

****. Yup, it's the motor mount. Sun of a gun leaked like crazy. Picture below

So I guess a couple questions then:

1) Can I replace this myself?
2) How much will it cost if I take it in to get it fixed.
and lastly, does it NEED to be replaced right away? I really don't know how long it's been like this, so what will happen if I do not replace it?

 

bahhhhhhh. I've noticed this sound as well. Time to check it right now.

edit: just checked, no sign of leaking.

 

Yes, you can replace it yourself. The mount will be around $95 at the dealer. Clean the crud up with rubbing alcohol. Do a how to search to understand how and what tools you may need.

 

does this mean I have one of the "bad ones"? I sure hope not, this thing only has 41,XXX on it...hope it isn't going to be giving me too much trouble down the road

 

Great time to upgrade to the WMW/TSW upper motor mount which will never leak and will last the life of the car probably. I hate replacing poorly designed parts with the same part......

One of the first things I had to do when I picked up my '05 R53:
http://billswebspace.com/MCSPulleyMountTensioner.htm

Be sure to check the lower mount too, with the upper mount bad it might have had some additional stress placed on it.